Bucket still

How about this?!

The Bucket Still is the simplest you can imagine without a special electrical heat source, just using sunshine. Float a bowl in the wash, cover the lot with a layer of plastic or clingwrap. Sit something heavy on the clingwrap so that any condensate that forms on the wrap will run down to the middle, and drip into the bowl. Leave the bucket etc somewhere warm.

This process will take a long time to collect very much at all, and will be of quite low strength, but is probably better than nothing.

(click to enlarge)

The improved Bucket Still

In case you want to build a bucket still, you can improve it's preformance by adding an electrical heatsource, while maintaining a very simple and cheap design.